From 7fc289c039ca3cdbad0f050e17c1b1d13e684c73 Mon Sep 17 00:00:00 2001
From: Robert Adams
Date: Sat, 15 Feb 2014 17:02:53 -0800
Subject: Properly restore position on crossing failure for mega-regions. Fix
 odd "cannot cross into banned parcel" viewer error message when crossing into
 non-existant region. Proper permission failure messages are now returned.

---
 OpenSim/Region/Framework/Scenes/ScenePresence.cs | 46 ++++++++++++++++--------
 1 file changed, 32 insertions(+), 14 deletions(-)

(limited to 'OpenSim/Region/Framework/Scenes/ScenePresence.cs')

diff --git a/OpenSim/Region/Framework/Scenes/ScenePresence.cs b/OpenSim/Region/Framework/Scenes/ScenePresence.cs
index 576b8c2..d4af9fc 100644
--- a/OpenSim/Region/Framework/Scenes/ScenePresence.cs
+++ b/OpenSim/Region/Framework/Scenes/ScenePresence.cs
@@ -3473,8 +3473,6 @@ namespace OpenSim.Region.Framework.Scenes
                 Vector3 pos2 = AbsolutePosition;
                 Vector3 origPosition = pos2;
                 Vector3 vel = Velocity;
-                int neighbor = 0;
-                int[] fix = new int[2];
 
                 // Compute the avatar position in the next physics tick.
                 // If the avatar will be crossing, we force the crossing to happen now
@@ -3507,23 +3505,13 @@ namespace OpenSim.Region.Framework.Scenes
                             if (m_requestedSitTargetUUID == UUID.Zero)
                             {
                                 m_log.DebugFormat("{0} CheckForBorderCrossing: Crossing failed. Restoring old position.", LogHeader);
-                                const float borderFudge = 0.1f;
-
-                                if (origPosition.X < 0)
-                                    origPosition.X = borderFudge;
-                                else if (origPosition.X > (float)m_scene.RegionInfo.RegionSizeX)
-                                    origPosition.X = (float)m_scene.RegionInfo.RegionSizeX - borderFudge;
-                                if (origPosition.Y < 0)
-                                    origPosition.Y = borderFudge;
-                                else if (origPosition.Y > (float)m_scene.RegionInfo.RegionSizeY)
-                                    origPosition.Y = (float)m_scene.RegionInfo.RegionSizeY - borderFudge;
+
                                 Velocity = Vector3.Zero;
-                                AbsolutePosition = origPosition;
+                                AbsolutePosition = EnforceSanityOnPosition(origPosition);
 
                                 AddToPhysicalScene(isFlying);
                             }
                         }
-                             
                     }
                 }
                 else
@@ -3541,6 +3529,36 @@ namespace OpenSim.Region.Framework.Scenes
             }   
         }
 
+        // Given a position, make sure it is within the current region.
+        // If just outside some border, the returned position will be just inside the border on that side.
+        private Vector3 EnforceSanityOnPosition(Vector3 origPosition)
+        {
+            const float borderFudge = 0.1f;
+            Vector3 ret = origPosition;
+
+            // Sanity checking on the position to make sure it is in the region we couldn't cross from
+            float extentX = (float)m_scene.RegionInfo.RegionSizeX;
+            float extentY = (float)m_scene.RegionInfo.RegionSizeY;
+            IRegionCombinerModule combiner = m_scene.RequestModuleInterface<IRegionCombinerModule>();
+            if (combiner != null)
+            {
+                // If a mega-region, the size could be much bigger
+                Vector2 megaExtent = combiner.GetSizeOfMegaregion(m_scene.RegionInfo.RegionID);
+                extentX = megaExtent.X;
+                extentY = megaExtent.Y;
+            }
+            if (ret.X < 0)
+                ret.X = borderFudge;
+            else if (ret.X >= extentX)
+                ret.X = extentX - borderFudge;
+            if (ret.Y < 0)
+                ret.Y = borderFudge;
+            else if (ret.Y >= extentY)
+                ret.Y = extentY - borderFudge;
+
+            return ret;
+        }
+
         /// <summary>
         /// Moves the agent outside the region bounds
         /// Tells neighbor region that we're crossing to it
-- 
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